檔案下載(java) android

// /////////////////////////////////下載檔案功能如下//////////////////////////////////private void DownFile(String urlString){/* * 串連到伺服器 */double FileLength = 0;double DownedFileLength = 0;InputStream inputStream = null;URLConnection connection = null;OutputStream outputStream = null;try{URL url = new URL(urlString);connection = url.openConnection();if (connection.getReadTimeout() == 5){Log.i("---------->", "當前網路有問題");}inputStream = connection.getInputStream();} catch (MalformedURLException e1){// TODO Auto-generated catch blocke1.printStackTrace();} catch (IOException e){// TODO Auto-generated catch blocke.printStackTrace();}/* * 檔案的儲存路徑和和檔案名稱其中Nobody.mp3是在手機SD卡上要儲存的路徑，如果不存在則建立 */String savePAth = Environment.getExternalStorageDirectory()+ "/lzmDownload";File file1 = new File(savePAth);if (!file1.exists()){file1.mkdir();}String savePathString = Environment.getExternalStorageDirectory()+ "/lzmDownload/" + "test.png";File file = new File(savePathString);try{L.l("======================newFile:" + file.createNewFile());file.createNewFile();L.l("======================newFile:" + file.createNewFile());} catch (IOException e){// TODO Auto-generated catch blocke.printStackTrace();}/* * 向SD卡中寫入檔案,用Handle傳遞線程 */Message message = new Message();try{outputStream = new FileOutputStream(file);byte[] buffer = new byte[1024 * 4];FileLength = connection.getContentLength();L.l("==================FileSize:" + FileLength);message.what = 0;handler.sendMessage(message);while (DownedFileLength < FileLength){outputStream.write(buffer);DownedFileLength += inputStream.read(buffer);i = (int) (((double) DownedFileLength / FileLength) * 100);Message message1 = new Message();message1.what = 1; // downloading... the filehandler.sendMessage(message1);}Message message2 = new Message(); // finish the downloadmessage2.what = 2;handler.sendMessage(message2);} catch (FileNotFoundException e){// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e){// TODO Auto-generated catch blocke.printStackTrace();}}// ///////////////////如上為一個下載類/////////////////////////////////////////////